Why it looks like a wave
The wave effect isn't magic — it's optics. Here's how layered diffusion, LED geometry, and lens design combine to create the illusion of flowing water.
White base — the diffuser
The first printed layer is white PLA. White filament scatters light uniformly in all directions, softening harsh point-source LED light into a broad, even glow. This is your diffusion foundation — without it, you'd see individual LED dots through the lens.
Natural PLA — transmission with structure
Four layers of natural (translucent) PLA allow light to pass through while adding structural rigidity to the lens. Natural PLA transmits more light than white but still diffuses it slightly — creating depth without losing brightness. This is the key to the "glowing from within" effect.
Black PLA — the contrast mask
Black PLA blocks light completely. The lens pattern is defined by where black filament is and isn't — light only escapes through the gaps in the black layer, which is what creates the crisp wave lines. The black acts as a contrast mask, making the illuminated areas pop dramatically.
Why the LEDs alternate direction
The WS2812B strips are arranged in alternating directions — left-to-right, then right-to-left. This is called a serpentine layout. Combined with WLED's 2D matrix mode, it means each physical LED has an exact X/Y coordinate. Wave animations move smoothly across the grid because the software knows precisely where each light sits in 2D space.
⚠️ Why smooth build plates matter
Textured build plates leave micro-ridges on the bottom surface of the lens. These ridges scatter light unpredictably, softening the crisp edge definition of the wave lines. A smooth PEI or glass build plate produces a flat bottom layer that lets light pass through cleanly and keeps the pattern sharp.